Anti-Reflection Circular Polarizer with Polyester Moisture Barrier
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional anti-reflection polarizers for organic electroluminescent (EL) image display devices face issues with moisture resistance and heat resistance, leading to degradation of anti-reflection functionality and panel deformation under high humidity conditions due to the use of triacetyl cellulose (TAC) substrates.
Innovation Solution
An anti-reflection circular polarizer comprising a reflection reduction layer, a light-transmissive substrate film with low moisture permeability, a polarizing element, and a λ/4 phase-difference layer, where the substrate film is made of polyester with specific moisture permeability and in-plane retardation values to prevent deformation and maintain functionality under high humidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If TAC film is used as polarizing element protection substrate, then transparency and optical isotropy are improved, but moisture resistance and heat resistance deteriorate
Solution Approach 1:
The patent replaces the durable but moisture-resistant TAC film with a cheaper, shorter-lived polyester film that has improved moisture resistance through specific structural modifications (orientation and thickness control), accepting that the film may need replacement over time while achieving better overall device performance
Solution Approach 2:
The patent changes the physical parameters of the polyester film, specifically controlling its thickness to 12-50 μm and its orientation state (uniaxial or biaxial stretching), to achieve the desired balance between transparency, moisture resistance, and mechanical stability
2Stability of the object's composition
If TAC film is used as polarizing element protection substrate, then optical isotropy is improved, but panel deformation increases under high humidity
Solution Approach 1:
The patent modifies the physical parameters of the polyester film by controlling its thickness (12-50 μm) and orientation state through uniaxial or biaxial stretching processes, achieving both optical isotropy and resistance to panel deformation under high humidity conditions
Solution Approach 2:
The patent creates a composite structure where the polyester film serves as both the protection substrate and the moisture barrier, integrating multiple functions into a single material system rather than using separate TAC film with additional protective layers
3Illumination intensity
If TAC film is used as polarizing element protection substrate, then image quality is improved, but moisture penetration into PVA increases
Solution Approach 1:
The patent uses a more cost-effective polyester film with controlled thickness and orientation that provides adequate moisture protection for the PVA polarizing element, accepting that the film may require periodic replacement while maintaining image quality
Solution Approach 2:
The patent optimizes the polyester film parameters (thickness: 12-50 μm, orientation state) to create an effective moisture barrier that protects the PVA polarizing element from moisture penetration while maintaining optical performance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides an anti-reflection circular polarizer that effectively prevents external light reflection and maintains image quality in organic EL devices by minimizing degradation and deformation under high humidity conditions.
Implementation Method 1
the light-transmissive substrate film has a moisture permeability of 100 g/m2·day or less
Implementation Method 2
a polarizing element, and a λ/4 phase-difference layer, stacked in this order, wherein the light-transmissive substrate film has a moisture permeability of 100 g/m2·day or less
Implementation Method 3
a λ/4 phase-difference layer
Data Source
AI summary
An excellent anti-reflection circular polarizer for preventing the reflection of external light is provided, and thereby an excellent image display device with very little degradation of anti-reflection functionality caused by decreased levels of polarization under conditions of high humidity while having little deformation of an image display panel is provided. In particular, an anti-reflection circular polarizer suitable for an organic EL image display device is provided. The anti-reflection circular polarizer includes a reflection reduction layer, a light-transmissive substrate film, a polarizing element, and a λ/4 phase-difference layer, stacked in this order, wherein the light-transmissive substrate film has a moisture permeability of 100 g/m2·day or less.